Chen Joyce L, Zatorre Robert J, Penhune Virginia B
Montreal Neurological Institute, McGill University, Rm. 276, 3801 University St., Montreal, QC, Canada H3A 2B4.
Neuroimage. 2006 Oct 1;32(4):1771-81. doi: 10.1016/j.neuroimage.2006.04.207. Epub 2006 Jun 14.
When listening to music, we often spontaneously synchronize our body movements to a rhythm's beat (e.g. tapping our feet). The goals of this study were to determine how features of a rhythm such as metric structure, can facilitate motor responses, and to elucidate the neural correlates of these auditory-motor interactions using fMRI. Five variants of an isochronous rhythm were created by increasing the contrast in sound amplitude between accented and unaccented tones, progressively highlighting the rhythm's metric structure. Subjects tapped in synchrony to these rhythms, and as metric saliency increased across the five levels, louder tones evoked longer tap durations with concomitant increases in the BOLD response at auditory and dorsal premotor cortices. The functional connectivity between these regions was also modulated by the stimulus manipulation. These results show that metric organization, as manipulated via intensity accentuation, modulates motor behavior and neural responses in auditory and dorsal premotor cortex. Auditory-motor interactions may take place at these regions with the dorsal premotor cortex interfacing sensory cues with temporally organized movement.
听音乐时，我们常常会不自觉地让身体动作与节奏的节拍同步（比如跺脚）。本研究的目的是确定节奏特征（如节拍结构）如何促进运动反应，并使用功能磁共振成像（fMRI）阐明这些听觉 - 运动交互作用的神经关联。通过增加重音和非重音音调之间的声音幅度对比度，逐步突出节奏的节拍结构，创建了等时节奏的五个变体。受试者与这些节奏同步敲击，随着五个级别中节拍显著性的增加，更响亮的音调会引发更长的敲击持续时间，同时听觉和背侧运动前皮层的血氧水平依赖（BOLD）反应也会增加。这些区域之间的功能连接也受到刺激操作的调节。这些结果表明，通过强度强调操纵的节拍组织会调节听觉和背侧运动前皮层的运动行为和神经反应。听觉 - 运动交互作用可能发生在这些区域，背侧运动前皮层将感觉线索与有时间组织的运动相连接。
